We Solved the Worst Part of a Coyote Swap
FFG's complete wiring harness system for 1967-72 Ford F-Series trucks is here. Jason breaks down everything — how it was designed, what's in the kit, what it works with, and why we spent six figures and hired a full-time electrical engineer to build it from scratch.
Wiring is the number one thing that kills builds. Guys spend months piecing together universal harnesses that weren't designed for their truck, hunting down connectors that don't match, using switches with wrong voltage ratings, and troubleshooting electrical gremlins for weeks because nothing was planned as a system. Wrong gauge wire on a 35-amp fan circuit is how trucks burn down. And when something goes wrong six months later, there's no schematic to trace — just a rats nest behind the dash nobody wants to touch. That's exactly what this system was built to eliminate.
If you're doing a Coyote swap (Gen 1 through Gen 4) or Godzilla swap in a 67-72 Ford, this is the first wiring system actually engineered for your truck. Not universal. Not adapted. Purpose-built — the same harness we use in-house on our own builds.
Shop the full wiring system here:
https://fatfender.com/products/1967-1972-ford-wire-harness?_pos=1&_psq=wire+harness&_ss=e&_v=1.0&variant=46546696798398
The system starts with the main harness — a modular setup with front, cab, and rear sub-harnesses connected through bulkhead connectors. Everything is pre-wired, labeled circuit by circuit, and designed to install in under two weeks even if you've never touched wiring before. Our guys in the shop do it in five to seven days.
What makes this a true complete system is the five companion kits we built around it. You're not just getting wire — you're getting everything you need to finish the job without sourcing a single part:
Connector Kit — every terminal, pigtail, and weather seal matched to the harness:
https://fatfender.com/products/ffg-connector-kit
Switch Kit — correct voltage and amperage for modern powertrains, fits original cab aesthetics:
https://fatfender.com/products/ffg-switch-kit
Crimp Tool Kit — the exact tools we use in our harness shop:
https://fatfender.com/products/ffg-crimp-tool-kit
Mounting Plate Kit — laser-cut steel plates pulled from our turnkey build layouts:
https://fatfender.com/products/ffg-wire-harness-mounting-plate-kit
Power Center Kit — centralized circuit protection and clean power routing:
https://fatfender.com/products/ffg-wiring-harness-power-center-kit
You can run just the main harness if you already have your own connectors and tools, but the add-on kits are what make this a wire-your-truck-in-two-weeks experience instead of a two-month scavenger hunt.
Supports Coyote and Godzilla engines, 10R80 and 10R140 automatics, manual transmissions including BMT82 and T-56 Magnum, 6R80, and integrates with Dakota Digital gauges and Coach Control modules. Also set up for returnless fuel systems — pulse width modulated, the way the Coyote was designed to run. We sell the PWM kits that make that work:
https://fatfender.com/search?q=Returnless+Pulse+Width+Modulation+Kit
The harness comes with a 60+ page manual that walks you through every step, including what a good crimp looks like versus a bad one. This is the full recipe.
67-72 is available now at fatfender.com. Next up is 53-56 Ford in about 30 days, then 73-79 dentside by mid to late summer. After that we're working back through 61-66 and 57-60, then into Gen 1 Mustangs and Fox Bodies. Chevy LS and LT harnesses are on the roadmap after that.
If you're not doing a modern Ford engine swap — running a 302, 390, 428, or any carbureted setup — this isn't the harness for you. We still sell American Autowire kits for those applications and they'll work great.
Drop a comment if you've got questions about fitment or which kits you need for your build.
More questions? [email protected]
Follow along on Instagram @fatfendergarage and TikTok @fatfenderaz for more harness content and install walkthroughs.
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